Anybody who is going into cryptocurrency should choose bitcoin and then focus on a long time investment plan because there is every chance of making profit in the future even though profit is not guaranteed, invest with the amount you can afford to loss.
Just like you said, profit is not guaranteed and most people come into bitcoin investment with the knowledge that they will make high profits from it then they invest little amount and hope that the price will skyrocket to the moon so that they will make enough profits. People needs to focus more on investing more from time to time and increase their portfolio instead of thinking about the profits they can get. Let us even remove the profits that can come along while investing in bitcoin, only the security of your assets is even enough.